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The phenomenon of radioactivity was discovered by -
(a) Marie Curie (b) Pierre Curie (c) Henri Becquerel (d) J. J. Thomson
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(c) Henri Becquerel
4 years ago
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NDA Other Question
Two atoms are said to be isotopes if -
(a) they have the same atomic number but different mass numbers
(b) they have the same number of neutrons but different mass numbers
(c) the sum of the number of protons and neutrons is the same, but the number of protons is different
(d) they have the same number of neutrons but different modes of radioactive decay
The principle of cleaning by soap is -
(a) surface tension (b) floatation (c) viscosity (d) elasticity